I have been making bio with success for over a year but my last few batches went wrong ,the oil titrated at 3 and I had a successful sepatation but when I started the washing stage the bio broke up and the whole lot went milky and their wasn't a clear water bio separation it has something to do with the oil may be the fast food out let put something else in the oil animal fat ,any ideas ,I can, ask them as I buy it from someone that collects it